Cornstarch Substitutes: The Best Thickeners

The Power of Cornstarch

Cornstarch is a powerhouse ingredient in the kitchen, prized primarily for its incredible thickening abilities. Extracted from the endosperm of corn kernels, it is pure starch, containing no protein or fat. When heated in a liquid, the starch granules absorb water, swell, and eventually burst, releasing starch molecules that tangle together to create a thick, glossy, and clear gel. Because it is pure starch, it has twice the thickening power of regular flour. It is the secret to glossy Asian stir-fry sauces, perfectly set fruit pies, and silky puddings. When choosing a substitute, you must consider whether the final dish needs to be clear or opaque, and how long it will be cooked.

The Easiest Swap: All-Purpose Flour

The most accessible substitute for cornstarch is regular all-purpose wheat flour. Because flour contains protein (gluten) in addition to starch, it is not as efficient at thickening. To substitute flour for cornstarch, you need to use twice as much. If a recipe calls for 1 tablespoon of cornstarch, use 2 tablespoons of flour.

There are a few key differences to keep in mind. First, flour creates an opaque, cloudy finish, making it less ideal for clear fruit glazes but perfect for gravies and creamy soups. Second, flour must be cooked longer—at least 2 to 3 minutes of simmering—to eliminate its raw, powdery taste. Finally, always mix the flour with a little cold water to create a slurry before adding it to hot liquids to prevent lumps.

The Best for Clear Sauces: Arrowroot Powder

If you are making a delicate fruit pie, a clear glaze, or a glossy stir-fry sauce, arrowroot powder is the superior substitute. Extracted from the roots of a tropical plant, arrowroot behaves very similarly to cornstarch. It creates a beautiful, transparent gel and imparts absolutely no flavor to the dish. You can substitute it in a strict 1:1 ratio.

Arrowroot has a unique advantage: it tolerates acidic ingredients (like lemon juice or vinegar) better than cornstarch. However, it does not hold up well to prolonged high heat or vigorous boiling, which can cause the gel to break down and the sauce to thin out. Therefore, it is best to whisk in an arrowroot slurry at the very end of the cooking process.

Potato Starch for Baking and Frying

Potato starch is another excellent gluten-free thickener. Like arrowroot, it can be substituted for cornstarch in a 1:1 ratio and yields a relatively clear finish. It thickens very quickly at a lower temperature than cornstarch, making it great for last-minute adjustments. Beyond thickening, potato starch is fantastic for frying. If you’ve run out of cornstarch for your crispy chicken coating, potato starch is an incredibly popular alternative (especially in Asian cuisines like Korean fried chicken), yielding a fiercely crunchy, golden crust.

Tapioca Starch for Pies

Tapioca starch (or tapioca flour) is derived from the cassava root. It is an exceptional thickener for fruit pies and cobblers because it creates a glossy finish and holds up wonderfully to freezing and thawing (unlike cornstarch, which can turn spongy if frozen). Substitute 2 tablespoons of tapioca starch for every 1 tablespoon of cornstarch. Be aware that if used in boiled sauces, tapioca can sometimes create a slightly stringy or gooey texture, so it is best reserved for baked desserts.

Conclusion

Thickening a sauce without cornstarch is a simple matter of looking in your pantry. For rustic gravies and stews, double the amount of all-purpose flour. For clear, glossy sauces, reach for arrowroot or potato starch. By understanding how each starch behaves under heat, you can achieve the perfect consistency every time.